1 /* Copyright 2016, Ableton AG, Berlin. All rights reserved.
2 *
3 * This program is free software: you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation, either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 *
16 * If you would like to incorporate Link into a proprietary software application,
17 * please contact <link-devs@ableton.com>.
18 */
19
20 #pragma once
21
22 #include <ableton/platforms/asio/AsioService.hpp>
23 #include <ableton/util/Injected.hpp>
24
25 namespace ableton
26 {
27 namespace discovery
28 {
29
multicastEndpoint()30 inline asio::ip::udp::endpoint multicastEndpoint()
31 {
32 return {asio::ip::address::from_string("224.76.78.75"), 20808};
33 }
34
35 // Type tags for dispatching between unicast and multicast packets
36 struct MulticastTag
37 {
38 };
39 struct UnicastTag
40 {
41 };
42
43 template <typename IoContext, std::size_t MaxPacketSize>
44 class IpV4Interface
45 {
46 public:
47 using Socket = typename util::Injected<IoContext>::type::template Socket<MaxPacketSize>;
48
IpV4Interface(util::Injected<IoContext> io,const asio::ip::address_v4 & addr)49 IpV4Interface(util::Injected<IoContext> io, const asio::ip::address_v4& addr)
50 : mIo(std::move(io))
51 , mMulticastReceiveSocket(mIo->template openMulticastSocket<MaxPacketSize>(addr))
52 , mSendSocket(mIo->template openUnicastSocket<MaxPacketSize>(addr))
53 {
54 }
55
56 IpV4Interface(const IpV4Interface&) = delete;
57 IpV4Interface& operator=(const IpV4Interface&) = delete;
58
IpV4Interface(IpV4Interface && rhs)59 IpV4Interface(IpV4Interface&& rhs)
60 : mIo(std::move(rhs.mIo))
61 , mMulticastReceiveSocket(std::move(rhs.mMulticastReceiveSocket))
62 , mSendSocket(std::move(rhs.mSendSocket))
63 {
64 }
65
66
send(const uint8_t * const pData,const size_t numBytes,const asio::ip::udp::endpoint & to)67 std::size_t send(
68 const uint8_t* const pData, const size_t numBytes, const asio::ip::udp::endpoint& to)
69 {
70 return mSendSocket.send(pData, numBytes, to);
71 }
72
73 template <typename Handler>
receive(Handler handler,UnicastTag)74 void receive(Handler handler, UnicastTag)
75 {
76 mSendSocket.receive(SocketReceiver<UnicastTag, Handler>{std::move(handler)});
77 }
78
79 template <typename Handler>
receive(Handler handler,MulticastTag)80 void receive(Handler handler, MulticastTag)
81 {
82 mMulticastReceiveSocket.receive(
83 SocketReceiver<MulticastTag, Handler>(std::move(handler)));
84 }
85
endpoint() const86 asio::ip::udp::endpoint endpoint() const
87 {
88 return mSendSocket.endpoint();
89 }
90
91 private:
92 template <typename Tag, typename Handler>
93 struct SocketReceiver
94 {
SocketReceiverableton::discovery::IpV4Interface::SocketReceiver95 SocketReceiver(Handler handler)
96 : mHandler(std::move(handler))
97 {
98 }
99
100 template <typename It>
operator ()ableton::discovery::IpV4Interface::SocketReceiver101 void operator()(
102 const asio::ip::udp::endpoint& from, const It messageBegin, const It messageEnd)
103 {
104 mHandler(Tag{}, from, messageBegin, messageEnd);
105 }
106
107 Handler mHandler;
108 };
109
110 util::Injected<IoContext> mIo;
111 Socket mMulticastReceiveSocket;
112 Socket mSendSocket;
113 };
114
115 template <std::size_t MaxPacketSize, typename IoContext>
makeIpV4Interface(util::Injected<IoContext> io,const asio::ip::address_v4 & addr)116 IpV4Interface<IoContext, MaxPacketSize> makeIpV4Interface(
117 util::Injected<IoContext> io, const asio::ip::address_v4& addr)
118 {
119 return {std::move(io), addr};
120 }
121
122 } // namespace discovery
123 } // namespace ableton
124